Up until recently, Microsoft's OneDrive platform would allow you to create groups that could then be utilized by multiple users to collaborate on projects. The storage for the document-centric group would be separate from your standard OneDrive storage - but alas, groups appears to be dead.
If you head over to groups.live.com, you will see that you can no longer create a new group, but the good news here is that if you have an existing group, your documents are fine and you can continue to use the platform as before. The notification about the shutdown was found on an Answer forum.
We have reached out to Microsoft to see what the official word is on the death of groups but seeing as it has already been scaled back, we don't expect it to return anytime soon.
Microsoft's OneDrive platform has quickly become the company's centerpiece for cloud connectivity with the service being made available on every major OS and smartphone platform. With apps aplenty and deep integration into Windows-based devices, OneDrive is Microsoft's answer to having your documents always at your fingertips.
[Update] Per Microsoft, users are still able to share content with 'Shared' folders, and users can still invite new contacts to existing OneDrive groups.